[UPROPERTY](Programming/UnrealArchitecture/Reference/Properties)(Config, EditAnywhere, Category=Transport)
bool EnabledByDefault
Whether UDP messaging is enabled by default. If false -messaging will need to be added to the commandline when running non-editor builds.
in Shipping builds ALLOW_UDP_MESSAGING_SHIPPING=1 must also be defined in TargetRules for messaging to be available with or without this setting)